Accounting for forward currency contacts in Treasury

Hi Gurus,

As per accounting standard 11 following entry needs to be passed while entering into forward exchange contracts:

Foreign currency receivable A/c------- Rs  45

Deferred Premium A/c----------------------Rs   3

To Amt Payable to bank------------------Rs 48

Here Rs 45 is spot rate on date of contract, Rs 3 is swap rate and Rs 48 is forward rate for USD.

As per standard settings no accounting is triggered as on contract date with update type 'OTC001' (Open OTC transaction). Please guide how to configured the system to trigger accounting entry on date of contract with Deferred premium amount calculated automatically based on units of currency traded and swap rate.

Regards